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北京大学《ACM/ICPC大学生程序设计竞赛训练》暑期课面向全球招生!

AC代码加给一组案例

Posted by teitoku at 2018-03-23 16:41:33 on Problem 2481
#include<stdio.h>
#include<cstring>
#include<algorithm>
#include<vector>
#include<queue>
#include<stack>
#include<iostream>
using namespace std;
typedef long long ll;

const int maxn=(int)3e5+10;
int c[maxn];
#define lowbit(x) x&(-x)
int n=maxn/2;
int updata(int x,int y)
{
	for(int i=x;i<=n;i+=lowbit(i))
		c[i]+=y;
}
int getsum(int x)
{
	int sum=0;
	for(int i=x;i;i-=lowbit(i))
		sum+=c[i];
	return sum;
}
struct node
{
	int first;
	int second;
	int id;
}p[maxn];
int outit[maxn];
int cmp(node p1,node p2)
{
	if(p1.second!=p2.second)
	return p1.second>p2.second;
	if(p1.first!=p2.first)
		return p1.first<p2.first;
	return 0;
}
int main()
{
	int n;
	while(scanf("%d",&n)!=EOF)
	{
		memset(c,0,sizeof(c));
		if(n==0)
			return 0;
		for(int i=1;i<=n;i++)
		{
			scanf("%d%d",&p[i].first,&p[i].second);
			p[i].first+=2;
			p[i].second+=2;
			p[i].id=i;
		}
		sort(p+1,p+n+1,cmp);
		stack<int>st;
		for(int i=1;i<=n;i++)
		{
			if(!(p[i].second==p[i-1].second&&p[i].first==p[i-1].first))
			{
				while(!st.empty())
				{
					updata(st.top(),1);
					st.pop();
				}
			}
			outit[p[i].id]=getsum(p[i].first);
			st.push(p[i].first);
		}
		printf("%d",outit[1]);
		for(int i=2;i<=n;i++)
		{
			printf(" %d",outit[i]);
		}
		printf("\n");
	}

}/*
6
2 4
5 5
1 7
1 1
2 5
6 7
 */

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